245772121 has 4 divisors (see below), whose sum is σ = 280882432. Its totient is φ = 210661812.

The previous prime is 245772103. The next prime is 245772139. The reversal of 245772121 is 121277542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (245772103) and next prime (245772139).

It is a cyclic number.

It is not a de Polignac number, because 245772121 - 2¹⁵ = 245739353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245772151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17555145 + ... + 17555158.

It is an arithmetic number, because the mean of its divisors is an integer number (70220608).

Almost surely, 2^245772121 is an apocalyptic number.

It is an amenable number.

245772121 is a deficient number, since it is larger than the sum of its proper divisors (35110311).

245772121 is an equidigital number, since it uses as much as digits as its factorization.

245772121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35110310.

The product of its digits is 7840, while the sum is 31.

The square root of 245772121 is about 15677.1209410402. The cubic root of 245772121 is about 626.3891201848.

The spelling of 245772121 in words is "two hundred forty-five million, seven hundred seventy-two thousand, one hundred twenty-one".